Notes: This well developed and old specimen lived on the (calcareous) rock pieces and mosses on the top of a fence.
At the begining several possibilities appeared for the classification, namely:
C. bachmanianum, C. polycarpon and C. tenax.
The data obtained from microscopy fits very well with the data of Collema polycarpon given in CNALH:
Asci cylindrical to clavate with 8 spores;
Spores hialine often fusiform with more or less acute ends in general 3-septate, though there are some 1- or 2-septate, with the following average values: Me = 18.4 × 7 µm ; Qe = 2.6 (N=38).
According to CNALH, C. bachmanianum has bigger and more septate spores (see MO76956 for an example) and the spores of C. tenax similar in dimensions are submuriform with 1-2 longitudinal septa (see MO76181 and MO66329 for examples).
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Created: 2011-10-18 14:17:55 CDT (-0400)
Last modified: 2011-10-18 14:18:36 CDT (-0400)
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